Air admittance valve



FIG. 1 is a front perspective view of an air admittance valve showing mynew design;

FIG. 2 is a front plan view;

FIG. 3 is top plan view;

FIG. 4 is a bottom plan view; and,

FIG. 5 is a left side view, a view from the right side being a mirrorimage.

The ornamental design for an air admittance valve, as shown anddescribed.